Looking for a new lens for my d40
At the moment i'm leaning towards the Nikon AF-S VR 70-300mm
Nikon AF-S VR 70-300mm
But i've just found the following lenses
Tamron 70-300mm
and
Sigma 70-300mm
First off, i assume both those lenses will still be able to be used in auto focus mode with my d40?
Is the nikon lens worth the extra money?